hey yall. i'm in the market for a vintage svt buts i gots me a question i was hoping yall could answer. the sound difference between pre magnavox era and magnavox era. reading the threads, i find that the 69 heads used a rarer power tube section. but is it true that pre magnavox were made with 6550's in 1970? also and again what do some of you folk think about the comparison in sound, parts and maintanance between the pre and magnavox era. not much conclusive on the threads so maybe this one will provide us all with some more insight. also thanks to all yall for the other info i picked up searching through threads. theres a party at talkbass now and everyones invited! thanks for help!